A blood-red chain of pure force appears, howling instead of rattling as it shakes and twines.

You create a chain of force, which lashes out and attacks your enemies. The chain has a reach of 15 feet, but cannot move from the space you designate. The chain attacks by attempting to trip your foes (+12 melee touch attack, +15 on the opposed Strength check]]. It does not provoke attacks of opportunity for tripping, nor can it be tripped in response on a failed attempt. If it succeeds in tripping an enemy, it immediately follows up with a melee attack on the prone defender (+12 melee attack, 2d6+10 points of damage). Any creature struck by the chain must succeed on a Will saving throw or become shaken.

A howling chain can make one attack of opportunity each round for every four caster levels you have, using the same tactic as above.

A howling chain has as many hit points as you do when you're undamaged, and its AC is 20 (-1 size, +11 natural). It takes damage as a normal creature, but most magical effects that don't deal damage do not affect it. It makes saving throws as its caster. Disintegrate or a successful dispel magic destroys it.